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Kalshi vs Polymarket: what traders need to know

Kalshi is a regulated event-exchange popular with US retail and institutional traders. Polymarket is a decentralised prediction-market exchange built on Polygon that uses pUSD, CLOB order books, and UMA for resolution. If you’re a crypto-native trader weighing Kalshi against Polymarket, the core differences are custody, settlement model, and where arbitrage opportunities appear. PolyArb is an arb tool built for Polymarket users seeking low-latency intra-market edge and automated alerts.

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What Kalshi is and how it differs

Kalshi operates as a regulated event-exchange in the United States and targets a different compliance model and user base than Polymarket. It settles trades under CFTC oversight and provides a centralized, fiat-settled experience aimed at US customers. Polymarket, by contrast, is decentralised on Polygon, trades in pUSD, and uses Gnosis CTF outcome tokens and UMA for resolution. Those structural differences affect custody, onboarding, and where arbitrage strategies can run.

Where arbitrage lives on Polymarket

Polymarket’s CLOB architecture creates fast, intra-market arbitrage opportunities: when the sum of best asks for all outcomes is below $1.00 you can buy a complete set and lock the difference as edge. The market mechanics — binary YES/NO pairs, multi-outcome sets, tick-size behaviour, and gasless Relayer execution — define how quickly spreads open and close. PolyArb watches the CLOB in real time and hunts those intra-market inefficiencies.

Why latency, alerts, and non-custodial matters

Arbitrage windows on Polymarket are usually seconds long. Latency and execution matter: PolyArb offers 40ms latency versus ~800ms for many free bots, reducing slippage and partial fills. Non-custodial operation means you keep your pUSD and outcome tokens; PolyArb routes orders through the CLOB and uses the Relayer model already built into Polymarket. Real-time Telegram and Discord alerts let you act or audit automated fills as they happen.

Trade economics and the PolyArb fit

Fees, tick size, and resolution risk shape realized returns. Polymarket charges variable taker fees by category (0%–1.8% range), makers pay zero, and UMA dispute windows affect settlement timing. PolyArb is priced at $99/month and promises a $7.62 minimum guaranteed edge per trade while providing automated execution, low-latency routing, and alerts to help capture transient spreads on Polymarket.

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FAQ

Is Kalshi the same as Polymarket?
No. Kalshi is a regulated, fiat-centric event exchange serving US users under CFTC rules. Polymarket is a decentralised prediction-market exchange on Polygon using pUSD, Gnosis CTF outcome tokens, and UMA for resolution.
Can I arbitrage between Kalshi and Polymarket?
Cross-platform arbitrage is possible in theory but falls outside PolyArb’s scope. PolyArb focuses on intra-market arbitrage inside Polymarket’s CLOB where complete-set and binary spreads appear most reliably.
What risks should I know on Polymarket?
Known risks include resolution and dispute delays via UMA, slippage and partial fills, fee changes, smart-contract risk, and geo/restriction limits. No trade should be called risk-free without enumerating these factors.
How does PolyArb compare on speed and guarantees?
PolyArb advertises 40ms latency versus roughly 800ms for many free bots, plus a $7.62 minimum guaranteed edge per trade, Telegram and Discord alerts, and non-custodial execution on Polymarket.

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